Children’s body temperature is measured in different parts of the body, their normal body temperature values are also different. The details are as follows: 1. The normal axillary temperature of children is between 36℃-37℃; 2. The temperature of children’s mouth and anus is about 0.5℃ higher than the axillary temperature, and the normal value of oral body temperature is between 36.5℃-37.5℃, and the normal range of rectal temperature is 36.7℃-37.7℃. Axillary body temperature below 35℃ belongs to the body temperature does not rise, its may be due to the damage of the thermoregulatory center. And 37.3℃-38℃ is low fever, 38.1-39℃ is moderate fever, 39.1-40℃ is high fever, and over 41℃ is ultra-high fever. An elevated body temperature in children suggests that there may be inflammation in the body, and its most common cause is caused by infection, especially colds caused by viral infections. Therefore, it is important to avoid taking children to crowded places during the cold and flu season, and to pay attention to the warmth of the child to avoid pneumonia caused by a serious cold. In addition, when measuring the temperature of children, the thermometer should be disinfected and sterilized to prevent infection, which can be done with alcohol. The most commonly used measurement methods include axillary, oral, and anal methods. The axillary method is less prone to cross-infection, while the oral and anal methods are more accurate. In addition, parents should pay attention to the use of anal testing method before the application of petroleum jelly lubrication, so as not to scratch the child’s rectal mucosa.